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  1. The Total Volume of Apical and Lateral Meristem [PDF]
  2. Lateral Meristems of Higher Plants: Phytohormonal [PDF]
  3. Control of Lateral Meristem Formation In Anturrhhinum [PDF]
  4. Function of Apical Meristems {PPT]
  5. Botany Ch4 Tissues [PPT]
  6. Plant Structure & Tissues - Lateral Meristem [DOC]
  7. What is Botany - Lateral Meristem [DOC]

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Article About Lateral Meristem Definition and Function



Lateral Meristem Definition

Lateral meristem is a meristem (as the cambium and cork cambium) that is arranged parallel to the sides of an organ and that is responsible for increase in diameter of the organ.

When you were a child or a teen, you were responsible for much more than doing chores or listening to loud music. You also had to grow! Cells at the ends of the long bones in your arms and legs divided, adding more bone to the bone that was already there. The bone extended and you got taller.

The lateral meristem is concerned with secondary growth in the sense that its meristematic activity adds cells to the primary body which was derived from the apical meristems.

Lateral Meristem Definition and Function

Plants grow in pretty much the same manner, though they don't have to buy new jeans every year to keep up with their growth spurts! The tips of plant shoots and roots contain a tissue called a meristem, named after the Greek word merizein, which means 'divide.' The meristem contains small, tightly packed cells whose sole job is to divide and make the plant longer. The meristems at the tips of a plant are called apical meristems, derived from the Latin term apex, which means 'tip.'

Lateral meristems (pericycle, procambium and cambium, phellogen) are positioned in parallel to the lateral surface of the organ, where they are present, and produce concentric layers of undifferentiated cells. Primary lateral meristems, procambium and pericycle, arise during embryogenesis; secondary lateral meristems, cambium and phellogen, — during post embryonic development. Pericycle is most pluripotent plant meristem, as it may give rise to a variety of other types of meristems: lateral meristems (cambium, phellogen), apical meristems of lateral roots, and also shoot meristems during plant in vitro regeneration. Procambium and cambium developing from it give rise to the vascular tissues of the stems and roots, ensuring their thickening.

Some plants, like some people, do not just grow up, but they grow out, as well. This, however, is a much different process in plants and humans. Plants that grow out, like trees and other woody plants, also contain a lateral meristem, from the Latin latus, meaning 'side.' A lateral meristem causes a plant to grow laterally.

Lateral Meristem Function

While the apical meristem is responsible for vertical growth, the lateral meristem is responsible for lateral growth, or growth in diameter. This type of growth is known as secondary growth because it is growth around an already established stem.

In all woody plants and some herbaceous plants, there are two types of lateral meristems: the vascular cambium and the cork cambium. Similar to the procambium of the apical meristem, the vascular cambium produces secondary xylem and phloem; however, the procambium is also accountable for the development of wood that increases the girth of a plant. The cork cambium give rise to the periderm, which is similar to the protoderm. While the protoderm produces the primary epidermis growth of a plant, the periderm replaces that epidermis to produce bark. The bark acts like a shield for the plant, barring it from physical damage and preventing water loss via a waxy substance called suberin.

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Meristem tissue situated parallel to the surface of the plant organs. For example kambium and kambium Cork (felogen). Kambium including secondary meristem because parenkim which is derived from the meristem is back. This meristem tissue function is doing secondary growth, i.e. increase the diameter of the rod. The diameter of the stem can grow due to cleavage kambium towards inside and outwards. Kambium intravaskuler divides the direction in shaping xilem secondary and outwards to form a secondary floem. Kambium intervaskuler divide outwards to form the element towards the splitting of the skin and in shaping the elements of wood. Kambium cleavage results will form concentric circles called the circle of the year. Circle of the year awakens from the activity of the Division throughout the year and its thickness is influenced by the season.
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